Spring AOP AfterThrowing Advice example using XML configuration
Spring AOP after throwing advice executed when a method exits by throwing an exception. Spring framework provides a marker interface ThrowsAdvice
. There are not any methods on this interface, as methods are invoked by reflection.
Some valid method examples :
public void afterThrowing(Exception ex);
public void afterThrowing(RemoteException);
public void afterThrowing(Method method, Object[] args, Object target, Exception ex);
public void afterThrowing(Method method, Object[] args, Object target, ServletException ex);
In this example, I have used the same code as used in the last two previous tutorials. Only little changes in LoggingService
and spring.xml
file.
1- Spring AOP Before Advice example using XML configuration
2- Spring AOP After Returning Advice example using XML configuration
Let’s see the complete example.
Bussiness Class
Same as previous.
package org.websparrow.business;
import org.websparrow.exception.InvalidAcNoException;
public class Bank {
private String accountNo = "XYZ123";
private int amount = 1000;
public int deposit(int amount, String acNo) {
if (acNo.equals(this.accountNo)) {
System.out.println("inside deposit method...");
this.amount = this.amount + amount;
return this.amount;
} else {
throw new InvalidAcNoException();
}
}
}
Exception Class
Same as previous.
package org.websparrow.exception;
public class InvalidAcNoException extends RuntimeException {
private static final long serialVersionUID = 9087720614302482902L;
@Override
public String toString() {
return "INVALID ACCOUNT NUMBER";
}
}
Service Class
LoggingService
class implements ThrowsAdvice
interface.
package org.websparrow.service;
import org.springframework.aop.ThrowsAdvice;
public class LoggingService implements ThrowsAdvice {
public void afterThrowing(Exception ex) {
System.out.println("............I'M EXECUTED WHEN AN EXCEPTION OCCURS...................");
}
}
XML Configuration
Same as previous.
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- create target -->
<bean id="b" class="org.websparrow.business.Bank" />
<!-- create advice -->
<bean id="ls" class="org.websparrow.service.LoggingService" />
<!-- add target + advice to proxy -->
<bean id="proxy" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="b" />
<property name="interceptorNames">
<list>
<value>ls</value>
</list>
</property>
</bean>
</beans>
Test it
To test the application, create a Client
class, load the configuration file, call deposit
method and pass invalid account number and run it.
package org.websparrow.test;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.websparrow.business.Bank;
public class Client {
public static void main(String[] args) {
ConfigurableApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Bank bank = (Bank) context.getBean("proxy");
int totalAmount = bank.deposit(500, "ABC321");
System.out.println("Total Amount: " + totalAmount);
context.close();
}
}
When you enter the invalid account number, After Throwing service executed first.
NFO: Loading XML bean definitions from class path resource [spring.xml]
............I'M EXECUTED WHEN AN EXCEPTION OCCURS...................
Exception in thread "main" INVALID ACCOUNT NUMBER
at org.websparrow.business.Bank.deposit(Bank.java:20)
at org.websparrow.business.Bank$$FastClassBySpringCGLIB$$6e18a1e.invoke()
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:747)
Download Source Code: spring-aop-afterthrowing-advice-example-using-xml-configuration
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